Spring.



El. PLETSCH.

SPRING.

APPLIGATION FILED FEBHI, 1910.

)9552213535 ep', @Wwf/ UNITED sTATEs PATENT oEEioE.-

HENRY PLET$C H, 0F CHICAGO, ILLINOIS, ASSIG-NOR TO JUDD LAUNDRY MACHINE COMPANY, OF CHICAGO, ILLINOIS,

A CORPORATION OI" DELAWARE.

SPRING.

Specification of Letters Patent.

Patented May 9, 1911 Application led February 7, 1910. Serial No. 542,693.

To all 'whom 'it may concern.'

.acters in both the figures The htension spring A has atone end the plug B provided with the lug B1 attached to any desired device B2 by means of the screw B3, and at the other end, the p lug C. The rod D provided at one end with the eyelet D1 engaging any desired devicevsuch as the cyelet D2, is slidably mounted wit-hin the plugs B and C and carries adjustably mounted thereupon the collars D3, D4. The compression spring'E of lesser stiffness than Aand within the spring A has atY one end the plug F slidably mounted upon Vthe rod D, and at the other end restsupon the plug C. While I have show n in my drawing an operative spring, still it will be evident 'that numerous changes might bc made bothA in thesize and arrangementof parts Without departing from the spirit of my invention.

l Wish, therefore, that my drawing be considered in a sense as diagrammatic.

The use and operationof my invention are as follows Myspriiig is made up of a combination of twg springs, one stiifer than the other. The weaker spi-ing is alcoiiipres-- sion spring located within the .stronger which is a tension spring. When force is exerted tc extend the spi-ing, the compression j spring will first be compressed. until a cerf tain predetermined' pointI has been reached.,

i\t this point the .compression spring willno" longer change its shape butI will remain under compression at that point. The stronger tension spring will then take up 'the load and be extended quite independent of the compression spring. I mount these springs concentrically about al supporting tension rod, and provide this rod with adjustable collars or other devices, whereby the work of the compression spring may be regulated- -load where the other one leaves it. minimizes the Wear and tear upon the' between certain limits independent ofthe spring itself. By this means I am enabled to determine the point at which' the tension 'spring will take up the load and the length of travel of the force before its application lo the tension spring. By this means also-l. am able to provide a spring member whereiii are two springsl'one of which takeslup "T is springs and enables the use of a niuch shorter spring for the same elasticity or the use of a spring of greater elasticity for the same length than anything heretofore provided.

I have not shown this spring in Aconnection with any particular mechanical device,

as it will be evident. that it may be used fory .an infinite number ot' different Vpurposes where springs are used. I cl'aiin:-

1. A spring comprising a heavy tension member, a perforated plug in' ea'ch end of said member. a light compression member,

one end of said member engaging one of the plugs within the tension member, a perforated plug iii the other end of the compression member-a rod slidably engaging said 'perforated plugs, and a plurality of adjustable collars mounted upon said rod and adapted toengage the plug upon the compression member and one of the plugs withiii'the tension member.

2..A spring comprising a heavy tension member, perforated plugs screw threaded within each end of said tension member, a screw threaded rod slidably mounted within said pli-lgs, collars screw threaded and adjustable upon said` rod. the distance between them beng at .jall timesless than the distance betweenl said plugs, an inner light compression member surrounding said rod and in engagement? at one end with one of .said plugs, and a perforated plug screw threaded Within the other end of saidcompression member slidably mounted upon the rod ai'id in engagement with one of said collars.

HENRY PLETscH. y Wit-nessesz H'. JUDD, FRANCIS PARKER, Jrt 

